EHCI_XFER_ABORTING
if (ex->ehci_xfer_flags & EHCI_XFER_ABORTING) {
while (ex->ehci_xfer_flags & EHCI_XFER_ABORTING)
ex->ehci_xfer_flags |= EHCI_XFER_ABORTING;
ex->ehci_xfer_flags &= ~EHCI_XFER_ABORTING;